Experimental study on mechanical behavior of brittle marble samples containing different flaws under uniaxial compression

Yang, Sheng‐Qi; Dai, Yonghao; Han, Lijun; Jin, Zu Quan

doi:10.1016/j.engfracmech.2009.04.005

Cited by 153 publications

(42 citation statements)

References 15 publications

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“…Besides, real engineering rock mass experienced by loading path is more complex, which makes that mechanical behavior of rock under complex loading paths has been more and more important. Re-fracture mechanical behavior of fractured rock has been one of the most important scientific questions [21][22][23]. However the refracture mechanical behavior of fractured rock is not clear under different loading paths, so it is necessary to explore the mechanical behavior of rock under different loading paths, which is helpful to the effective control of underground engineering rock unstable failure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Mechanical Behavior of Coarse Marble Under Six Different Loading Paths

Yang

Jing

et al. 2010

Exp Mech

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A series of triaxial compression experiments were preformed for the coarse marble samples under different loading paths by the rock mechanics servocontrolled testing system. Based on the experimental results of complete stress-strain curves, the influence of loading path on the strength and deformation failure behavior of coarse marble is made a detailed analysis. Three loading paths (Paths I-III) are put forward to confirm the strength parameters (cohesion and internal friction angle) of coarse marble in accordance with linear Mohr-Coulomb criterion. Compared among the strength parameters, two loading paths (i.e. Path II by stepping up the confining pressure and Path III by reducing the confining pressure after peak strength) are suggested to confirm the triaxial strengths of rock under different confining pressures by only one sample, which is very applicable for a kind of rock that has obvious plastic and ductile deformation behavior (e.g. marble, chalk, mudstone, etc.). In order to investigate refracture mechanical behavior of rock material, three loading paths (Paths IV-VI) are also put forward for flawed coarse marble. The peak strength and deformation failure mode of flawed coarse marble are found depending on the loading paths (Paths IV-VI). Under lower confining pressures, the peak strength and Young's modulus of damage sample (compressed until post-peak stress under higher confining pressure) are all lower compared with that of flawed sample; moreover mechanical parameter of damage sample is lower for the larger compressed post-peak plastic deformation of coarse marble. However under higher confining pressures (e.g. σ 3 =30 MPa), the axial supporting capacity and elastic modulus of damage coarse marble (compressed until post-peak stress under lower confining pressure) is not related to the loading path, while the deformation modulus and peak strain of damage sample depend on the difference of initial confining pressure and post-peak plastic deformation. The friction among crystal grains determines the strength behavior of flawed coarse marble under various loading paths. In the end, the effect of loading path on failure mode of intact and flawed coarse marble is also investigated. The present research provides increased understanding of the fundamental nature of rock failure under different loading paths.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Mechanical Behavior of Coarse Marble Under Six Different Loading Paths

Yang

Jing

et al. 2010

Exp Mech

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“…Therefore, the research on fracture and failure mechanism of rock-like brittle materials containing pre-existing flaws has a great academic significance in rock mechanics. Up to now, a lot of experimental studies (Brace and Bombolakis 1963;Hoek and Bieniawski 1965;Peng and Johnson 1972;Dey and Wang 1981;Petit and Barquins 1988;Shen et al 1995;Germanovich and Dyskin 2000;Celestino et al 2001;Wong and Einstein 2006;Yang et al 2009;Zhao et al 2010;Yang and Jing 2011;Haeri et al 2013) have been performed to further investigate the fracture and failure mechanism in different natural or rock-like materials. With the purpose of investigating the crack coalescence behaviors, Bobet and Einstein (1998) performed experimental study on rocklike samples with two pre-existing flaws, which showed that coalescence and failure occurred concurrently in uniaxial compression, but coalescence appears sooner than failure in biaxial compression.…”

Section: Introductionmentioning

confidence: 99%

The role of flaws on crack growth in rock-like material assessed by AE technique

Liu

et al. 2015

Int J Fract

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Experiments for the rectangular rock-like samples (made of high-strength gypsum and watercement ratio is 1) with two parallel pre-existing flaws subjected to uniaxial compression were carried out to further investigate the influence of varying flaw geometries on mechanical properties and crack coalescence behaviors. According to the tests results, eight crack types were characterized on a basis of the mechanisms of crack nucleation, formation and propagation, and seven coalescence modes occurred through the ligament, including S-mode, M1-mode, M2-mode, M3-mode, T1-mode, T2-mode and T3-mode. The AE and photographic monitoring techniques were adopted to further clarify the procedure of the crack coalescence and failure during uniaxial compression tests and in consequence the whole process of crack emergence, growth, coalescence and failure was recorded in real time. The results of AE technique revealed that the characteristics of acoustic emission energy associate with crack coalescence modes, and AE location method can emphasize the moments of crack occurrences and follow the crack growth until final failure. This study put forward better understanding of the fracture and failure mechanism of underground rock engineering, like rock burst.

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“…Three crack coalescence modes, namely, the shear mode, the mixed shear/ tensile mode, and the wing tensile mode, were observed. Yang et al (2008Yang et al ( , 2009a investigated the strength and failure behavior of precracked marble under uniaxial and triaxial compression. The results showed that the compressive strength of a precracked sample was closely related to the geometry of the flaw.…”

Section: Introductionmentioning

confidence: 99%

Influence of coupled effect among flaw parameters on strength characteristic of precracked specimen: Application of response surface methodology and fractal method

Liu

Lin

Zheng

et al. 2015

Journal of Natural Gas Science and Engineering

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a b s t r a c tHydraulic slotting is an effective method for enhanced coalbed methane (ECBM) recovery, and it has been widely employed in China. Although there have been many studies of this technique, the influence of slot parameters on the strength characteristic of the coal, which is an important factor that affects the permeability enhancement effect, has rarely been studied. Thus, only limited information is available regarding the pressure relief and permeability enhancement mechanisms of this technique. In the current study, the influence of flaw parameters on the compressive strength of a precracked sample under biaxial compression is discussed. The results indicate that an increase in the flaw length and width has a negative effect on the compressive strength, whereas an increase in the flaw inclination angle has a positive effect on the compressive strength. The results of the response surface methodology (RSM) indicate that the interactions among the flaw parameters have a significant influence on the compressive strength. The propagation patterns of cracks are quantified by the fractal dimension, which is used to explore the mechanism of compressive strength variation with changes in the flaw parameters. The study results indicate that the variation in the flaw parameters changes the propagation pattern of cracks, resulting in different compressive strengths. In addition, an opposite variation trend of the compressive strength and fractal dimension with flaw parameters is also observed. The research results are expected to guide the field application of hydraulic slotting.

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Experimental study on mechanical behavior of brittle marble samples containing different flaws under uniaxial compression

Cited by 153 publications

References 15 publications

Experimental Investigation on Mechanical Behavior of Coarse Marble Under Six Different Loading Paths

Experimental Investigation on Mechanical Behavior of Coarse Marble Under Six Different Loading Paths

The role of flaws on crack growth in rock-like material assessed by AE technique

Influence of coupled effect among flaw parameters on strength characteristic of precracked specimen: Application of response surface methodology and fractal method

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